Tablīgh presents an extreme that remains both logically and customarily possible. Ighrāq reaches an extreme logically conceivable but beyond customary occurrence, while ghuluww asserts an extreme judged logically impossible. The question of literary acceptability is a further and distinct issue.
DegreeLogical possibilityCustomary occurrence
TablīghPossiblePossible
IghrāqPossibleBeyond ordinary custom
GhuluwwImpossibleImpossible
Context, evidence and imaginative effect still matter in deciding whether a particular exaggeration is rhetorically successful.